CAS No: 52-90-4
Assay: 98.5% – 101.0%
Grades Available: Food Grade (FCC), Pharma Grade (USP/EP), Cosmetic Grade
L-Cysteine CAS 52-90-4
Description
L-Cysteine CAS 52-90-4 Quick Details
Chemical Name: L-Cysteine
CAS No.: 52-90-4
EC No.: 200-158-2
Molecular Formula: C3H7NO2S
Molecular Weight: 121.16
Appearance: White crystalline powder
Assay: >= 98.0%
L-Cysteine CAS 52-90-4 Specification
| Parameter | Specification |
| Product Name | L-Cysteine |
| CAS Number | 52-90-4 |
| Chemical Formula | C3H7NO2S |
| Molecular Weight | 121.16 g/mol |
| Appearance | White crystalline powder |
| Assay (Purity) | 98.5% ~ 101.0% |
| Specific Optical Rotation [α]D20 | +8.3° to +9.5° |
| Loss on Drying | ≤ 0.5% |
| Residue on Ignition | ≤ 0.1% |
| Heavy Metals (as Pb) | ≤ 10 ppm |
| Standard Compliance | USP / EP / FCC / AJI |
L-Cysteine CAS 52-90-4 Applications
1. Baking & Food Industry (Dough Conditioner):
Functions as a reducing agent in bread and dough formulations, breaking disulfide bonds in gluten to improve dough extensibility, reduce mixing time, and optimize texture.
Precursor for savory and meat-like flavoring reaction compounds.
2. Cosmetics & Personal Care:
Acts as a skin conditioning agent and antioxidant; aids in reducing melanin production for skin whitening formulations.
Used in permanent wave (hair perming) formulations as a gentle, low-odor reducing agent.
Packaging & Shipping
25kg/Fiber Drum with dual polyethylene inner bags; 1kg/aluminum foil bag available for trial samples.
Storage
Keep sealed in a cool, dry, and dark environment (≤ 25°C). Avoid exposure to direct sunlight and moisture.